package com.example.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
@Aspect //告诉框架这是一个切面
@Component //随着Spring的启动而启动
public class UserAspect {
    //定义切点
    @Pointcut("execution(* com.example.aop.controller.UserController.*(..))")
    public void pointcut(){

    }
    @Before("pointcut()")
    public void beforeAdvice(){
        System.out.println("执行了前置通知");
    }
    //后置通知
    @After("pointcut()")
    public void afterAdvice(){
        System.out.println("执行了后置通知");
    }

    //环绕通知
    @Around("pointcut()")
    public Object aroundAdvice(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("进入环绕通知");
        Object object=null;
        //执行目标方法
        object=joinPoint.proceed();
        System.out.println("退出环绕通知");
        return object;
    }
}
